Modularized heat exchange system for flue gas waste heat of roasting furnace

Abstract

The utility model discloses a modular heat exchange system for flue gas waste heat of a roasting furnace. The modular heat exchange system comprises a multi-stage flue gas waste heat exchanger body, a circulating heat exchange module, a first cold source and a second cold source, the multi-stage flue gas waste heat exchanger body is sequentially provided with at least two sub-stage heat exchangers from the high-temperature end to the low-temperature end according to a flue, and flue gas is exhausted after being subjected to heat exchange through the two sub-stage heat exchangers in sequence. The circulating heat exchange module is connected to the first sub-stage heat exchanger to form a circulating heat source, and the circulating heat exchange module is provided with at least one first plate heat exchanger; the first cold source is connected to the other sub-stage heat exchanger; the second cold source is connected with the first plate heat exchanger and used for conducting heat interaction with the circulating heat source. The heat exchange module can be used for carrying out heat exchange operation on a plurality of cold sources at the same time, each heat exchange module exchanges heat independently, and the heat exchange module has high flexibility.

Description

Technical Field

[0001] This utility model relates to the technical field of ball mill steel ball screening equipment, and in particular to a modular heat exchange system for waste heat from calcining furnace flue gas. Background Technology

[0002] Waste heat recovery technology from calcining furnace flue gas has significant application value in current industrial fields. Effectively utilizing the waste heat in the flue gas emitted from calcining furnaces can not only improve energy efficiency and reduce production costs, but also reduce environmental pollution and achieve sustainable development. Waste heat recovery from calcining furnace flue gas mainly relies on equipment such as heat exchangers and heat pipes to recover heat from the flue gas and use it in other processes through heat conduction and convection. Traditional waste heat recovery equipment for calcining furnaces relies on a single cold source for heat exchange, which does not maximize the recovery of waste heat. This not only limits the full recovery of waste heat from the flue gas, but also forces the entire system to shut down for maintenance when the single cold source fails, resulting in the loss of valuable heat resources. Therefore, this application provides a modular heat exchange system for waste heat from calcining furnace flue gas to solve the technical problems of insufficient utilization of waste heat from a single cold source and the complete shutdown caused by cold source failure for maintenance. Utility Model Content

[0003] This utility model provides a modular heat exchange system for waste heat from calcining furnace flue gas, which can simultaneously perform heat exchange operations on multiple cold sources. Each heat exchange module exchanges heat independently, providing high flexibility.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A modular heat exchange system for waste heat from calcining furnace flue gas includes a multi-stage waste heat exchanger body, a circulating heat exchange module, a first cold source, and a second cold source. The multi-stage waste heat exchanger body is provided with at least two sub-stage heat exchangers sequentially from the high-temperature end to the low-temperature end of the flue gas duct. The flue gas is discharged after passing through the two sub-stage heat exchangers in sequence. The circulating heat exchange module is connected to one of the first sub-stage heat exchangers to form a circulating heat source. The circulating heat exchange module is provided with at least one first plate heat exchanger. The first cold source is connected to the other sub-stage heat exchanger. The second cold source is connected to the first plate heat exchanger for heat exchange with the circulating heat source.

[0006] Furthermore, the circulating heat exchange module includes a circulating pipeline, a circulating medium storage tank, a circulating pump, and a first plate heat exchanger; the circulating medium storage tank stores circulating medium; the circulating medium storage tank is connected to one end of the circulating pump, the other end of the circulating pump is connected to the inlet end of a sub-stage heat exchanger, the outlet end of the sub-stage heat exchanger is connected to the heat source inlet end of the first plate heat exchanger through the circulating pipeline, and the heat source outlet end of the first plate heat exchanger is connected to the circulating medium storage tank; the circulating medium continuously flows between the sub-stage heat exchanger, the first plate heat exchanger, and the circulating medium storage tank through the circulating pump to form the circulating heat source; the second cold source enters from the cold source inlet end of the first plate heat exchanger and exits from the cold source outlet end of the first plate heat exchanger.

[0007] Furthermore, the modular heat exchange system for waste heat from calcining furnace flue gas also includes a third cold source; the circulating heat exchange module also includes a second plate heat exchanger, the heat source inlet end and the heat source outlet end of the second plate heat exchanger are connected in parallel on the circulating pipeline, and the third cold source enters from the cold source inlet end of the second plate heat exchanger and exits from the cold source outlet end of the second plate heat exchanger.

[0008] Furthermore, a first control valve is provided between the heat source inlet end of the second plate heat exchanger and the circulation pipeline; a second control valve is provided in the circulation pipeline at a position between the heat source inlet end and the heat source outlet end of the second plate heat exchanger.

[0009] Furthermore, a third plate heat exchanger is provided between the first cold source and the corresponding sub-stage heat exchanger; the first cold source exchanges heat with a heat source through the third plate heat exchanger.

[0010] The beneficial effects of this utility model are:

[0011] 1) This utility model divides the multi-stage flue gas waste heat exchanger body into multiple sub-stage heat exchangers. Each sub-stage heat exchanger is an independent heat exchange module, which can independently carry out the heat exchange work of the circulating heat exchange module and the first cold source without interfering with each other. Moreover, the circulating heat source can also exchange heat with the second cold source through the first plate heat exchanger. The circulating heat exchange module has high flexibility. When the heat exchange demand needs to be increased, only the corresponding first plate heat exchanger needs to be added to the circulating heat exchange module. There is no need to carry out large-scale modification of the entire system. In addition, each independent first plate heat exchanger has the ability to be taken out for maintenance independently. This means that if a first plate heat exchanger fails, the other first plate heat exchangers and other sub-stage heat exchangers can still continue to work normally without affecting the heat exchange work of other cold sources.

[0012] 2) The circulating heat exchange module can be connected to one or more first plate heat exchangers and the corresponding number of cold sources for independent heat exchange, without interfering with the heat exchange operation of the first cold source. When a third cold source needs to be added to the system, a second plate heat exchanger can be connected in parallel in the circulating heat exchange module. When the supply of the third cold source fails, the supply of the circulating heat source to the second plate heat exchanger can be cut off by the first control valve, and then the second control valve can be opened without affecting the circulation operation of the circulating heat source and avoiding affecting the heat exchange operation of other cold sources.

[0013] 4) Add a third plate heat exchanger between the first cold source and the corresponding sub-stage heat exchanger; this can increase the initial temperature of the first cold source and facilitate subsequent heating. Attached Figure Description

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Attached image labels:

[0017] 1-Multi-stage flue gas waste heat exchanger body, 2-First cold source, 3-Second cold source, 4-Circulation pipeline, 5-Circulation medium storage tank, 6-Circulation pump, 7-First plate heat exchanger, 8-Third cold source, 9-Second plate heat exchanger, 11-Sub-stage heat exchanger, 91-First control valve, 92-Second control valve, 21-Third plate heat exchanger. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Reference Figure 1 As shown, a modular heat exchange system for waste heat from calcining furnace flue gas includes a multi-stage waste heat exchanger body 1, a circulating heat exchange module, a first cold source 2, and a second cold source 3. The multi-stage waste heat exchanger body 1 is provided with at least two sub-stage heat exchangers 11 sequentially from the high-temperature end to the low-temperature end of the flue gas duct. The flue gas is discharged after passing through the two sub-stage heat exchangers 11 in sequence for heat exchange. The circulating heat exchange module is connected to the first sub-stage heat exchanger 11 to form a circulating heat source. The circulating heat exchange module is provided with at least one first plate heat exchanger 6. The first cold source 2 is connected to the other sub-stage heat exchanger 11. The second cold source 3 is connected to the first plate heat exchanger 6 and is used to exchange heat with the circulating heat source. Specifically, the multi-stage flue gas waste heat exchanger body 1 is divided into multiple sub-stage heat exchangers 11. Each sub-stage heat exchanger 11 is an independent heat exchange module, which can independently carry out the heat exchange work of the circulating heat exchange module and the first cold source 2 without interfering with each other. Moreover, the circulating heat source can also exchange heat with the second cold source 3 through the first plate heat exchanger 6. The circulating heat exchange module has high flexibility. When the heat exchange demand needs to be increased, only the corresponding first plate heat exchanger 6 needs to be added to the circulating heat exchange module. There is no need to carry out large-scale modification of the entire system. In addition, each independent first plate heat exchanger 6 has the ability to be taken out for maintenance independently. This means that if a certain first plate heat exchanger 6 fails, the other first plate heat exchangers 6 and other sub-stage heat exchangers can still continue to work normally without affecting the heat exchange work of other cold sources.

[0022] Specifically, the circulating heat exchange module includes a circulating pipeline 4, a circulating medium storage tank 5, a circulating pump 6, and a first plate heat exchanger 7; the circulating medium storage tank 5 stores circulating medium; the circulating medium storage tank 5 is connected to one end of the circulating pump 6, the other end of the circulating pump 6 is connected to the inlet end of a sub-stage heat exchanger 11, the outlet end of the sub-stage heat exchanger 11 is connected to the heat source inlet end of the first plate heat exchanger 7 through the circulating pipeline 4, and the heat source outlet end of the first plate heat exchanger 7 is connected to the circulating medium storage tank 5; the circulating medium continuously flows between the sub-stage heat exchanger 11, the first plate heat exchanger 7, and the circulating medium storage tank 5 through the circulating pump 6 to form the circulating heat source; the second cold source 3 enters from the cold source inlet end of the first plate heat exchanger 7 and exits from the cold source outlet end of the first plate heat exchanger 7, exchanging heat with the circulating heat source. The first plate heat exchanger 7 can be connected to the circulation pipeline in series or in parallel, and the number of the first plate heat exchangers 7 can be set to multiple according to the heat exchange requirements, so that they can be independently heat exchanged with multiple cold sources.

[0023] For example, if a third cold source 8 needs to be added to this system, a second plate heat exchanger 9 can be added to the circulating heat exchange module. The structure of the second plate heat exchanger 9 is similar to that of the first plate heat exchanger 7. The heat source inlet and outlet of the second plate heat exchanger 9 are connected in parallel to the circulating pipeline 4. The third cold source 8 enters from the cold source inlet of the second plate heat exchanger 9 and exits from the cold source outlet of the second plate heat exchanger 9, exchanging heat with the circulating heat source. To facilitate the control of the heat exchange operation of the second plate heat exchanger 9, a first control valve 91 is provided between the heat source inlet of the second plate heat exchanger 9 and the circulating pipeline; a second control valve 92 is provided in the circulating pipeline between the heat source inlet and outlet of the second plate heat exchanger 9. When the supply of the third cold source 8 fails, the supply of the circulating heat source to the second plate heat exchanger 9 can be cut off by the first control valve 91, and then the second control valve 92 can be opened without affecting the circulation operation of the circulating heat source and avoiding affecting the heat exchange operation of other cold sources. Similarly, when a fourth cold source is needed, multiple second plate heat exchangers 9 can be connected in parallel according to the heat exchange requirements; the parallel connection method of the first plate heat exchanger 7 can also adopt a similar structure.

[0024] In this embodiment, the first cold source 2 is connected to the last sub-stage heat exchanger 11, and the temperature of the last stage is slightly lower than that of the first stage. If a higher temperature is required for the first cold source 2, a third plate heat exchanger 21 can be added between the first cold source 2 and the corresponding sub-stage heat exchanger 11. The first cold source 2 exchanges heat with a heat source through the third plate heat exchanger 21 to increase the initial temperature of the first cold source 2, which is beneficial for subsequent heating.

[0025] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A modular heat exchange system for waste heat from calcining furnace flue gas, characterized in that, The system includes a multi-stage flue gas waste heat exchanger body, a circulating heat exchange module, a first cold source, and a second cold source. The multi-stage flue gas waste heat exchanger body is provided with at least two sub-stage heat exchangers sequentially from the high-temperature end to the low-temperature end of the flue. The flue gas is discharged after passing through the two sub-stage heat exchangers in sequence. The circulating heat exchange module is connected to one of the first sub-stage heat exchangers to form a circulating heat source. The circulating heat exchange module is provided with at least one first plate heat exchanger. The first cold source is connected to the other sub-stage heat exchanger. The second cold source is connected to the first plate heat exchanger for heat exchange with the circulating heat source.

2. The modular heat exchange system for waste heat from calcining furnace flue gas according to claim 1, characterized in that, The circulating heat exchange module includes a circulating pipeline, a circulating medium storage tank, a circulating pump, and a first plate heat exchanger; The circulating medium storage tank stores circulating medium; the circulating medium storage tank is connected to one end of the circulating pump, and the other end of the circulating pump is connected to the inlet end of one of the sub-stage heat exchangers; the outlet end of the sub-stage heat exchanger is connected to the heat source inlet end of the first plate heat exchanger through the circulating pipeline; the heat source outlet end of the first plate heat exchanger is connected to the circulating medium storage tank; the circulating medium continuously flows between the sub-stage heat exchanger, the first plate heat exchanger, and the circulating medium storage tank through the circulating pump to form the circulating heat source; the second cold source enters from the cold source inlet end of the first plate heat exchanger and exits from the cold source outlet end of the first plate heat exchanger.

3. The modular heat exchange system for waste heat from calcining furnace flue gas according to claim 2, characterized in that, The modular heat exchange system for waste heat from calcining furnace flue gas further includes a third cold source; the circulating heat exchange module further includes a second plate heat exchanger, the heat source inlet end and the heat source outlet end of the second plate heat exchanger are connected in parallel on the circulating pipeline, and the third cold source enters from the cold source inlet end of the second plate heat exchanger and exits from the cold source outlet end of the second plate heat exchanger.

4. A modular heat exchange system for waste heat from calcining furnace flue gas according to claim 3, characterized in that, The number of the second plate heat exchangers is set to a certain number.

5. A modular heat exchange system for waste heat from calcining furnace flue gas according to any one of claims 3 or 4, characterized in that, A first control valve is provided between the heat source inlet end of each second plate heat exchanger and the circulation pipeline; a second control valve is provided in the circulation pipeline at the position between the heat source inlet end and the heat source outlet end of each second plate heat exchanger.

6. The modular heat exchange system for waste heat from calcining furnace flue gas according to claim 1, characterized in that, A third plate heat exchanger is also provided between the first cold source and the corresponding sub-stage heat exchanger; the first cold source exchanges heat with a heat source through the third plate heat exchanger.

Images